Application of Response Surface Methodology to Optimize the Preparation of Rubber Foam Composite as Sound-Absorbing Material Using Scrap Rubber Powder

Abstract

In this paper, scrap rubber powder (SRP), azodicarbonamide (ADC) as foaming agent and double-component epoxy resins (ER) as binder were used to prepare porous sound-absorbing material of rubber foam composite (RFC) by hot-pressing process. Response surface methodology (RSM) was employed to evaluate three process variables, i e, specimen thickness (A), ADC dosage (B) and foaming temperature (C), and to establish two polynomial function model equation between sound absorption coeffcient (α) and three process factors (A, B, C) at middle and low frequency 250 Hz, 500 Hz, 800 Hz, 1 000 Hz to determine the optimal preparation condition of RFC. The statistical analysis of results demonstrated that specimen thickness (A) exerted signifcant impact on sound absorption properties of RFC. And the optimum prepared condition of RFC was 10 mm specimen thickness, 3.00 g ADC dosage, and approximately 196–foaming temperature. Under optimal condition, sound absorption coeffcient of RFC could reach 5.68% (250 Hz), 7.67% (500 Hz), 20.73% (800 Hz), 18.71% (1 000 Hz), coinciding with the predicted values 5.70% (250 Hz), 7.69% (500 Hz), 20.77% (800 Hz), 18.74% (1 000 Hz) from the predicted polynomial function model, which exhibited that RSM could be used to optimize the preparation process of sound-absorbing materials.

Keywords

RFC / RSM / thickness / ADC dosage / foaming temperature / sound absorption coeffcient

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